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1o. MUSA Expansion 10. ...... C I TY 0 F . ii , ._, cHANHAssEN .,, nl 1 690 COULTER DRIVE • P.O. BOX 147 • CHANHASSEN, MINNESOTA 55317 (612) 937-1900 • FAX (612) 937-5739 Adion by City Adr , , bdorsed DwA- IIII MEMORANDUM MWAd ,, Reic,tted- lli:: /- II TO: Don Ashworth, City Manager it sitt Charles Folch, City Engineer . , -n FROM: WE EJ 11_ lo I DATE: August 6, 1991 .. . SUBJ: Approve contract Amendment No. 1 to Scope of Services for I MUSA Expansion Comprehensive Sanitary Sewer and Water Study File No. 91-12 AA III , The consulting engineering firm *I., i, Anderlik, Rosene and Associates, Inc. (BRA) is currei, 1 tit working on the comprehensive 11 sanitary sewer and watermain at ,, f the new MUSA expansion area. At the same time, a comprehens- e s=1„er study for the Lake Riley -, system is nearing completion. XIn 1. ing at the two areas and the large area in th:tsouthe: t portion of the City north -- I of Pioneer Trail/County Rem... 4, it a •ears that there may be an opportunity to develop a I._ `g-term t t,k lc systera to serve all of these areas in a more enomical an efficient manner. The 1 A - information and results • -ct'erated from e Lake Riley system study -, will be of great value , n evaluating .- overall multi-drainage system facility. .-. 1 I have recently .co - erred with Bob Schu o cht of BRA as to the possibility •„ a s stem th-A would combine thee drainage ‘.. e: " '''''''' and the southeastern ,-,I portion of cLa*ASSAMENI 4' 4 ',,.. ' ,..' V 9 i---, ,,, .: '4' ,A "; 2 , , !, '',. -2 14). Mr. Schunicht 11. provided me with a work as ou qif` and cost estimate to proVi4fit ,.-se additional services si — is was not ....,- 1 part of the original 'f• -,'.. A •r service One of the important aspects of 04n-coting this additional study is . . I to determine the overall or -!, =ate" development flow from ' Chanhassen into the Lake Ann I ' ' and how that predicted quantity relates to the available downstream capacity in the MWCC 111 Red Rock Interceptor. To perform this study, one of the major work ' il efforts will involve reviewing past and present MWCC flow records and analyzing the Lotus Lake/Downtown district system and comparing the data to more accurately predict the fully developed flow rates 1 into the Lake Ann Interceptor: This predicted flow will need to be I , %or PRINTED ON RECYCLED PAPER 1 1 Don Ashworth August 6, 1991 Page 2 compared with the available capacity in MWCC's system (Red Rock Interceptor). If capacity is available, a formal request will be made to MWCC to grant Chanhassen the additional flow capacity. This task is important in determining a possible long -term sanitary sewer service strategy for the southeastern portion of Chanhassen. In the past it was thought that this area would be served in the future by a Bluff Creek Interceptor. MWCC does not have any plans ' to build this interceptor; thus, future sewer service to this area of the City is in question. However, an underlying key aspect of the work effort, as mentioned previously, will involve reviewing past and present MWCC flow records and comparing these to flow rates predicted and tested within the City's system. The MWCC's estimate of Chanhassen flow has increased dramatically during each of the last few years and the City's corresponding sewer payments have more than doubled. This may be an opportune time for the City to verify the accuracy ' of these MWCC flow estimates, get a handle on any specific problem areas that may exist and potentially save a significant amount of money in the form of payment to MWCC. ' The issue left to address then becomes the method of financing this work during a time when the City is currently operating on a fine - tuned and limited budget. I do not believe that it was possible to foresee the need for this work effort when the 1991 budget was prepared; however, this study may yield important ramifications related to the City's overall sewer flow quantity into the MWCC's Lake Ann Interceptor and corresponding benefits of the Infiltration /Inflow reduction program. Due to the desire for coordinating the Pavement Management Program and the Sanitary Sewer ' Rehabilitation Program, delays in the Pavement Management Program have also delayed the conducting of this year's Sewer Rehabilitation Program. Given the time remaining in this year's construction season, I do not believe it is likely that a sewer rehabilitation program will be undertaken this year. I am confident that it would be a wiser decision to reserve these monies to conduct a larger and more comprehensive program next year. 1 I would therefore propose that the funds needed for this study be allocated from the 1991 proposed Sewer Rehabilitation Program from Fund 401 since one of the major work efforts will have an impact on the City's I/I program. For 1991, $200,000 was budgeted for the repair and maintenance of sewer fa To date, roughly $43,000 has been spent for the emergen::y repair at lift station No. ' 1. This expenditure was budgeted for 1992 and as such will be reallocated to the fund next year. This still yields approximately $160,000 in the budget for the current year. If this appears to be a logical and prudent method of financing this additional work 1 Don Ashworth 1 August 6, 1991 Page 3 1 • effort, I would recommend that the City Council approve Contract Amendment No. 1 to increase the scope of services for the MUSA expansion comprehensive sanitary sewer and water study being prepared by BRA to include this additional work at a cost of $8,528 and that this cost be funded from the 1991 Sewer Rehabilitation budget under Fund 401. ktm 1 Attachment: 1. Letter from BRA dated July 17, 1991. c: Dave Hempel, Sr. Engineering Technician 1 Bob Schunicht, BRA 1 1 1 1 1 • 1 1 1 1 1 1 I - Otto G. Noncom PE Krum A. Gordon PE Mart R Ron. PE erne C Ronan. A IA B ones t ro o be W Rowse. PE Richard W Foster. PE. I , ert C. Russek A IA. Agin M Rog A1CP jj Joseph C. Anderr.. PE. Donald C. &roods. PE Thomas Argue PE. Jerry D PPnJUh PE Moran L. Sorva4. PE Jerry A. Roudon. PE Howard A Sansord PE Cecoo Outer. PE C —; Rosene Erhard E. Vow. PE. Mark A. Hanson. PE Daniel 1 Edgerton. PE. Roden 1 DRtsioA PE VI Anders i k & Glenn E R C . PE Ted K. Feld. PE Matt A. Seep PE Gary W. Morten P.E. VI Thomas Noyes PE Mrrhael T Naumann. PE Mass 1 Cassel P.E. Coen L Warmth PE. Eosert G khurecht. PE ,Eoben R. Metier*: PE. Ismael Manner. P.E. Kean R Yapp PE. A ssociates Susan M. Ebenn. CPA. Oond Q Losaxa. PE. Mark D WaIYS PE. Cranes A Enckson I Thomas W Peterson. PE. Thomas R Anderson AJA. Leo M Pa*elsty Olson Engineers 8 Architects James R. Meand. PE. Males 1 PE . M Kenneth P. Anderson, PE. L. mop Grsyer it P.E. 1 July 17, 1991 I , City of Chanhassen 690 Coulter Drive Chanhassen, MN 55317 1 Attn: Mr. Paul Krauss • I Re: MUSA Expansion Study Our File No. 39302 1 Dear Paul: I As we discussed at our meeting on July 16, 1991, our study of the MUSA Expansion Area and OSM's study of the Riley Lake Area have defined the facilities necessary to service the respective study areas. However, at the meeting, it was apparent that additional study is r required to evaluate joint facilities that could serve both study areas on an interim or permanent basis and to determine the amount of permanent capacity for the Bluff Creek Watershed in the Red Rock Interceptor. This letter outlines the work involved and costs to resolve these sewer I system issues and also presents the costs to complete an overall Comprehensive Sewer Policy Plan for the remainder of the City. I Our study of the MUSA expansion area has determined that there is sufficient capacity in the Lake Ann Trunk Sewer (north of Lake Susan) for wastewater flows from the Bluff Creek District north of Lyman Boulevard and that it is feasible to construct a lift station at Lyman I Boulevard and pump the wastewater to the Lake Ann Trunk near Powers Boulevard. OSM's study of the Riley Lake District indicates that upgrading of the sewer facilities around Rice Marsh Lake would be necessary to serve all the area within the MUSA. A sewer system I consisting of a combination of gravity and pressure facilities near Lyman Boulevard and T.H. 101 could provide interim solutions for the existing MUSA in the Bluff Creek and Riley Lake Districts and could also provide a permanent solution for sewer service to a portion or all of the 1 Bluff Creek District. The work involved in investigating this option solution is outlined below. Page 1. 39302.cor 1 • 2335 West Highway 36 • St. Paul. Minnesota 55113 • 612 -636 -4600 . I. BLUFF CYEEK/RILEY LAKE SYSTPM EVALUATION • A. Work Task Outline , 1. Analyze MWCC Flow Records 2. Analyze Lotus Lake/Downtown District System I 3. Determine Fully Developed Flow Rates 4. Determine Available Capacity in MWCC System (Red Rock Interceptor) • 5. Meet with MWCC to Request Allocation of Permanent Capacity I 6. Develop Preliminary Layout of Bluff Creek/Riley Lake System 7. Prepare Cost Estimates of Bluff Creek/Riley Lake System 8. Develop Cost Recovery Method for Recommended System I 9. Prepare Expanded Report B. Labor Hour and Cost Estimate 1 • Estimated Hourly Labor Classification Hours Rate Total I Principal/Project Manager 24 $65.00 $1,560 Registered Engineer 96 $56.00 5,376 Senior Draftsperson 24 $41.25 . 990 I Word Processing 8 $27.25 218 Clerical/Printing 4 $21.00 _84 $8,228 I Expense Allowance 300 TOTAL $8,528 of the Bluff Creek/Riley I Once the study k/Riley Lake system evaluation has been completed, the majority of Chanhassen's sanitary sewer system will have been studied. This work effort could easily be expanded to include the preparation of an overall Comprehensive Sewer Policy .Plan I (CSPP). The CSPP would tie together all the various sewer studies that the City has undertaken, add existing and unstudied areas, and provide a uniform guide for the rehabilitation, upgrading and expansion of the system throughout the entire City. The work tasks and ' estimated additional cost of expanding the study to prepare an overall CSPP are presented below: I II. COMPIZEH NSIVE SEWER PwCy PLAN A. Worts Task Qtftljne 1 1. Obtain Data on Existing System in Remainder of Chanhassen 2. Establish sewer service boundaries 3. Determine existing/future flows - I 4. Review. adequacy of existing facilities v Page 2 I 39302.cor , 1 1 L 5. Evaluate system improvement /rehabilitation alternatives I 6. Recommend ultimate system layout 7. Prepare cost estimates and Capital Improvement Program 8. Prepare Overall Trunk Sanitary Sewer System Map (2 color) I 9. Prepare Report and Present to City Council B. Labor Hour ansi Estirnatec1 Coo I - - ' - - Estimated Hourly - Labor Classification Hours Rate Total I Principal/Project Manager 28 $65.00 $ 1,820 Registered Engineer 160 $56.00 8,960 Senior Draftsperson 80 $41.25 3,300 I Word Processing 24 S27.25 654 Clerical/Printing 10 $21.00 210 $14 I Expense Allowance 1,200 TOTAL $16,144 • I We recommend that the City of Chanhassen authorize Part I of this submittal, Bluff Creek/Riley Lake System Evaluation, and that the City consider the expansion of the work effort to I complete an overall Comprehensive Sewer Policy Plan. I Yours very truly, 111 BONESTROO, ROSENE, ANDERLIK & ASSOCIATES, INC. . To.e,t, .1Cciu4e ' Robert G. Schunicht RGS:Ii 1 1 1 ' 1 ......1 Page 3. 39302.cor • :' .